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BA3842F 数据表(PDF) 11 Page - Rohm |
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BA3842F 数据表(HTML) 11 Page - Rohm |
11 / 13 page 573 Audio ICs BA3842F (6) Filter for preset equalizer (1) Low band The low cutoff frequency fc of each mode is given by the following equation : fc = 1 / 2 πCR = 1 / (2π C 15.6k Ω) When C = 0.22 µF, fc 46 (Hz) The fc value can be changed to make slight changes in the boost and cutoff gain of each mode. (2) High band The high cutoff frequencies fc of each mode are given by the following equation : fc = 1 / 2 πCR When C = 2200pF, ROCK : R = 8.0k Ω fc 9.0 (kHz) JAZZ : R = 10.7k Ω fc 6.8 (kHz) CLASSIC : R = 14.9k Ω fc 4.8 (kHz) BGM. POP : R = 17.4k Ω fc 4.2 (kHz) The fc values can be changed to make slight changes in the boost and cutoff gain of each mode. Note: If a high or low fc value is changed, the gains of all modes will change. The gain cannot be changed for only one mode. (7) ALC The band of ALC detection can be changed with the val- ue of C4. It must be adjusted appropriately for the dynam- ic bass boost fO. In the example application circuit C4 = 0.1 µF, thus fc = 1 / 2πC4 (R5 //R6 //R7) 160 (Hz) The detection wave is dually rectified. In the example ap- plication circuit, it is 1.3Vrms, but if the resistors R8 and R9 are connected as shown below, it will lower the ALC level. Adjust the ALC level as needed. The detection band at this time is : fc = 1 / 2 πC4 (R5 //R6 //R7 //R8 ///R9) (8) Attack time and release time Adjust the attack and release times with the resistors and capacitors connected to the ALCC pin. The attack time is determined by R10 (1k Ω) and C5, and the release time is determined by R11 and C5. If the value set for C5 is below 4.7 µF, the ALC level may become unstable. |
类似零件编号 - BA3842F |
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类似说明 - BA3842F |
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